I swapped my 73 doors for 77+ doors...they physically fit, but the biggest pain was the window regualtor shafts. You see, on the newer doors (77+), the shafts are longer.
If you swap your 74 guts into the 84 doors, the shafts will be too short. You will not be able to use the window cranks because the shafts do not stick out far enough beyond the door panel. Not only that, but you will have to remove the metal window glide channels from inside the 74 doors and weld them to the inside of the 84 doors.
I would swap the entire door assemblies and use the newer door panels and trim...that would be the easiest.
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